Saw IF Filter on LITaO3 for Color TV Receivers

Takahashi, Sadao; Hirano, Hirohiko; Kodama, T.; Miyashiro, Fumio; Suzuki, Bunzo; Onoe, A.; Adachi, T.; Fujinuma, K.

doi:10.1109/tce.1978.267038

Cited by 35 publications

(10 citation statements)

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“…II C. The optical waveguide is supposed to be created by annealed proton exchange, 19 and the analytical expression for the refractive index distribution n͑x 1 , x 2 ͒ is n͑x 1 ,x 2 ͒ = 2.138 + 0.0289e −͑0.08x 2 2 +0.0638͑x 1 − 175͒ 2 ͒ . ͑18͒…”

Section: B Simulation Of Optical Wavesmentioning

confidence: 99%

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Improving surface acousto-optical interaction by high aspect ratio electrodes

Dühring

Laude

Khelif

2009

Journal of Applied Physics

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The acousto-optical interaction of an optical wave confined inside a waveguide and a surface acoustic wave launched by an interdigital transducer ͑IDT͒ at the surface of a piezoelectric material is considered. The IDT with high aspect ratio electrodes supports several acoustic modes that are strongly confined to the surface, causing a significant increase in the strain underneath the surface. A finite element method is employed to model the surface acoustic waves generated by a finite length IDT with 12 electrode pairs and subsequently to study their interaction with an optical wave propagating in a waveguide buried in the lithium niobate substrate supporting the electrodes. The interaction can be increased up to 600 times using these new types of surface acoustic waves as compared to using a conventional IDT with thin electrodes. This result could find applications in improved acousto-optical integrated modulators.

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Section: B Simulation Of Optical Wavesmentioning

confidence: 99%

“…SAWs are extensively used in electromechanical filters and resonators for telecommunication as well as in oscillators and sensors. [2][3][4] A new application is the modulation of optical waves, see Ref.…”

Section: Introductionmentioning

confidence: 99%

Improving surface acousto-optical interaction by high aspect ratio electrodes

Dühring

Laude

Khelif

2009

Journal of Applied Physics

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“…Gains of 70-80 dB are available from these ICs which incidentally ensure good phase response and dynamic range of age as well as detection. With the commercially available SAW filters (Takahashi et al 1978) for colour TV IF amplifiers, very high attenuation at the adjacent channel sound and vision frequencies are achieved, however, with little additional cost to the VIF system. Japanese have recently come out with ZnO-SA W filters which would be much cheaper than the present lithium niobate SAW filters.…”

Section: Vision If Circuits (Vif)mentioning

confidence: 99%

Modern Trends in Colour TV Receiver Technology

Razzaque

1982

IETE Journal of Research

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“…Since total performances of current mobile communications are often limited by those of RF SAW/BAW devices, drastic enhancement of their performances is strongly demanded in addition to further reduction of physical size and price. About 40 years have been passed from the first commercialization of SAW devices [1]. From early days, seniors quite often claimed that SAW technologies have already been well developed, and device performances have been approached to their theoretical limits.…”

Section: Introductionmentioning

confidence: 99%